Impact tool with resilient striking surface



April 15, 1952 c. J. FISHER 2,592,883

IMPACT TOOL WITH R E SILIENT STRIKING SURFACE Filed Feb. 14, 1949 Fiy-3/1 H 25 F/ J8 INVENTOR CHARLES J fisHER ATTORN EY Patented Apr. 15,1952 UNITED STATES PATENT OFFICE IMPACT TOOL WITH RESILIENT STRIKINGSURFACE Charles J. Fisher, Wescosville, Pa.

Application February 14, 1949, Serial No. 76,235

Claims. 1

This invention relates to impact tools useful in removing indentationsfrom sheet metal. It relates more particularly to hammers, having novelhead constructions, which are especially useful for straightening outdeformed automobile fenders, bodies, or the like.

Various hammers, both hand and pneumatic types, are now used instraightening out deformed sheet metals such as automobile fenders. Suchhammer heads usually have a solid rectangular face and when the metal ishammered, while being supported by an anvil (sometimes referred to asdolly) on the opposite side of the metal, a dimpling effect will beobtained on the hammered metal surface. In order to obtain a smoothmetal surface after such shaping by hammering, the metal is generallyfiled with metal files until the surface is substantially smooth. Thefiling will diminish the thickness of the sheet and consequently weakenthe metal.

It is therefore the object of my invention to make a hammer which may beused in hammering deformed sheet metal into a substantially smoothsheet. Another object is to provide a hammer which may be used inhammering deformed sheet metal into such smooth surfaces thatsubstantially no subsequent filing of the metal is required to obtain asatisfactory smooth surface. An additional object is to provide a hammerof such construction that the work of smoothing deformed metal surfacesmay be accomplished in less time than is now accomplished withconventional metal working tools.

The aforesaid objects of my invention are accomplished by using impacttools, either hand or pneumatic hammers, utilizing a hammer head whichis constructed with a recessed face and a resilient striking member,which may consist of one or more elements mounted on one of the edges ofthe recessed face and extending across A the recess to the oppositeedge, thus forming a hollow space between the recessed face and theresilient striking member. Upon hitting a surface with the resilientstriking member, the member tends to momentarily flex inwardly towardthe hollow recess and then immediately rebound outwardly toward thestruck surface.

In the drawings Figure 1 is a side elevation of a hand hammer embodyingthe present invention.

Figure 2 is a side elevation, partially broken away, of a hammerembodying the present invention and Figures 2A and 2B illustrate inexploded views the component parts making up the hammer head illustratedin Figure 2.

Figure 3 is a front elevation of Figure 2 and Figures 3A and 3Billustrate in exploded views the end views of component parts of thehammer head illustrated in Figure 3.

Figure 4 is a front elevation of a modified hammer head.

Referring to detail in the drawings, Figures 1 and 2 show sideelevations of a hand hammer having hammer body portion In, handle 12,peening edge [4 and hammer head l6. Face I8 of hammer head I6 isrecessed and the ends 20 of the recessed face are enlarged for a purposedescribed below.

A resilient striking member 22 (Figure 2A), with reversely or backwardlybent ends 24, is mounted on the enlarged ends '20 of the hammer head.The enlarged ends 20 are provided with holes 26 through the bodyportions thereof. Pins 28 are inserted through holes '26 and plates 30(Figure' 2B) are mounted on each side of the striking element 22 andheld in place by inserting pins 26 through holes 32 of the plates.

The resilient striking member 22 is preferably made of carbon springsteel or similar resilient material. It may be made in a single solidpiece 34 as illustrated in Figure 4 or preferably in a multiple numberof separate elements placed parallel and in juxtaposed or adjacentposition to each other as illustrated in Figures 3 and 3A. In Figure 3the resilient member 22 is made up of five elements placed side to side;the number of elements may be increased or decreased depending on thesize of the hammer head and the use to which the hammer is applied. Theends 24 of member 22 are reversely bent and such reversely bent portionsserve to movably and loosely hold the striking member on the enlargedends 20. The enlarged ends 20 are preferably rounded although othershapes may suitably be used.

The recessed portion in hammer face F8 is preferably arcuate in shape asshown although angular recesses may be used with satisfactory results.

In use, when an indented piece of metal is struck with the hammer, theresilient member 22 will fiex inwardly toward the recessed face l8tending to close the hollow space between face l8 and member 22.Immediately thereafter, the spring action of member 22 will cause themember to flex outwardly again. This inward and outward action imparts aspringlike action and resilience to the hammer head.

Hammer heads constructed in accordance with the present invention may beused on impact tools generally such as pneumatic hammers, hand hammersand the like. i

Although I have shown and described herein the preferred embodiments ofmy invention, it is to be understood that the invention is not limitedthereto, and any change or changes may be made in materials, in thestructure and in the arrangement of parts within the scope of theattached claims.

I claim:

1. An impact tool comprising a hammer head having a recessed face androunded portions positioned at opposite ends of said recess, and aresilient striking member movably mounted and held in position on one ofsaid rounded portions, said mounted resilient striking member extendingfrom said rounded portion, serving as a mount for the member, across therecess to the rounded portion at the opposite end of the recess thusforming a hollow space between the recessed face and the strikingmember.

2. An impact tool comprising a hammer head having a recessed face androunded portions at opposite ends of said recess, a resilient strikingmember movably mounted on said rounded portions extending across therecessed face of the hammer head thus forming a hollow space between therecessed face and the striking member, and means on opposite sides ofthe recessed face mounted on pins extending through said roundedportions to hold said resilient memher in position.

3. A hammer for removing indentations from metal which comprises ahandle and a hammer body having a hammer head at one end of the body,said hammer head including a recess in the hammer face and roundedportions at opposite ends of said recess, a resilient striking membermovably mounted on one of the rounded portions and extending across therecess in the hammer face to the rounded portion at the opposite endthus forming a hollow space between the recessed face and the strikingmember, and means on opposite sides of the recessed face mounted on pinsextending through the rounded portions to hold the resilient member inposition.

4. A hammer as defined in the claim 3, and ,wherein the resilientstriking member includes at least two elements positioned parallel andadjacent to each other.

5. A hammer for removing indentations from metal which comprises ahandle and a hammer body having a. hammer head at one end of the body,said hammer head including an arcuately shaped recess in the hammer faceand rounded portions at opposite ends of said recess, a resilientstriking member including a multiplicity of parallel elements movablymounted on said rounded portions extending across the recess forming ahollow space between the elements and the recessed face, pins extendingthrough the rounded portions, and plates mounted on said pins positionedparallel to the sides of the striking member.

CHARLES J. FISHER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,732,985 Peters Oct. 22, 19292,282,932 Burnett May 12, 1942 FOREIGN PATENTS Number Country Date15,260 Great Britain July 8, 1904

